Study On Lateral Displacement Stiffness Of The Structure With Special-shaped Cross-section

During these years, with the development of the domestic economic and the living standard raised, houses have been required more comfortable than ever. Under this circumstances, the concrete special-shaped frames had been adopted throughout the whole country. Due to the particularity of geometric property of the section-special shaped cross-section, it has some differentiation from the rectangular cross-section. So it is indispensable to illustrate some mechanical characters of this structure.Among all the special-shaped columns,L-shaped column is the most especial.From the point of the elastic mechanic, we know that the functionφ= ay~3 can describethe bending of the beam. So we think that the functionφ= ay~3 +bz~3 can describe thecouple moment of bending for the L-shaped cross-section. Based on this assumption, some conclusions have been made in this paper. About the lateral displacement stiffness of the structure with special-shaped cross-section, from the point of thealgebora, we can derive it from the strain functionε_x=α+ by + cz ,and also get someuseful conclusions. At the same time,the lateral displacement stiffness of the T section and十section are achieved.The parameter of revisation for the lateral displacement stiffnes has been showed in this paper.The three-dimensional space analysis model of special-shaped column frame and rectangle column frame are established by using the general finite element software ANSYS in this paper. These two models have been established basing on the same areas of the two kinds of cross-sectional column.Some conclusions have been made from the results of analysis. Static and earthquake dynamic analysis show that the deformation of the regular special-shaped frame is same as that of the rectangular column frame, that is to say, it is shear deformation. The inner force of the column of the regular special-shaped frame can be achieved by the method of shear distribution.And comparison between theory and finite element method have been showned.As for the magnitute of lateral displacement stiffness of special-shaped structure, some conclusions have been made from the point of the direction of the load, the geometric of the cross-sections .At last,the example shown that the column of L section can not improve the lateral displacement stiffness of special-shaped structure and the display of the structure should be regular.Conclusions made in this paper are only referenced for the designers.